15.1.1 external monitors crash MBP M1Max

Updated to 15.1.1 on 2021 MBP M1Max. Using 2 external monitors worked flawlessly on 15.1. and prior OS. USB-C and USB-C to HDMI. When either or both are connected to MBP, works as expected for a few minutes, then MBP external monitor(s) flicker and MBP reboots, will just loop in flicker/reboot sequence. Cables/ports don't matter. 15.1.1 supposedly made a fix on"Display glitches on external monitors" which has made external monitors non-function on my system. Last time I will use an update on a Mac so soon to release...